What term describes the observable characteristics of an organism resulting from the interaction between its genotype and the environment?

• A. Phenotype
• B. Genotype
• C. Chromosome
• D. Epigenetics

Answer: (A)

Phenotype describes the observable characteristics of an organism that result from the interaction between its genetic makeup and the environment. The genotype provides the genetic blueprint, while environmental factors—such as nutrition, temperature, or experiences—shape how that blueprint is expressed in physical traits, physiology, and behavior. Epigenetics is about how environmental factors can influence gene expression without altering the DNA sequence, which can affect phenotype, but the term for the traits you can observe is phenotype. The genotype is the underlying genetic code, and chromosomes are the structures that organize DNA; neither is the set of observable traits.